Gronkowski, 23, closed on the Beacon Shores Street home in August, two months after he signed a six-year, $54 million contract extension with the Patriots.

Built in 2007, the 4,700-square-foot mansion boasts custom-built fish tanks, remote-controlled fire pits, two pools, a luxury spa, as well as a full gym, restaurant and bar.

The waterfront home also features a "casino-style security system" and "first-class staff," a sales listing states. Also included in the sale: a 26-foot Caravelle Bowrider powerboat, docked out back in Old Tampa Bay.

Gronkowski "was looking all over the area, in Miami and other places, and this just seemed like a good fit for him," listing agent Eric Panico said. Seller Duane Yost could not be reached.

Gronkowski's purchase closed for half a million less than the fully furnished home's $2.2 million listing price, sales listings shows.

The mansion's $1.6 million purchase price was just a fifth of Gronkowski's $8 million signing bonus.